Re: Screen update and feeling the bits between your toes

• To: mayer@wrc.xerox.com, SWM@sapsucker.scrc.symbolics.com
• Subject: Re: Screen update and feeling the bits between your toes
• From: Scott McKay <SWM@sapsucker.scrc.symbolics.com>
• Date: Mon, 14 Oct 1991 16:11-0400
• Cc: p2@porter.asl.dialnet.symbolics.com, clim@BBN.COM
• In-Reply-To: <9110141955.AA00368@fliff.wrc.xerox.com>

    Date: Mon, 14 Oct 1991 15:55 EDT
    From:	mayer@wrc.xerox.com (Jim Mayer)

    SWM@sapsucker.scrc.symbolics.com writes:
     > 
     > This is exactly the facility that DRAGGING-OUTPUT is intended to
     > provide, except that it presently uses REPLAY instead of "bitblt" to do
     > the feedback during dragging.  DRAGGING-OUTPUT could be changed to use
     > "bitblt", except that since "bitblt" can paint only rectangular regions,
     > the dragging of non-rectangular objects could damage some things that
     > should not be damaged.
     > 

    Just a note... Under window systems like X11 and NeWS, CopyArea
    (bitblt) is affected by the current clipping region and can, in fact,
    paint non-rectangular areas.

How about that.  I plead guilty to knowing less about X11 than I should,
and did not know that clipping regions could be non-rectangular.  Thanks.

0,,

• Re: Screen update and feeling the bits between your toes
• From: Jim Mayer <mayer@wrc.xerox.com>

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